How do i save a value in Datastore?

local DS = game:GetService("DataStoreService"):GetDataStore("Data")

local StatName = "Cash"

game.Players.PlayerAdded:Connect(function(user)
    user.leaderstats:FindFirstChild(StatName).Value = DS:GetAsync(user.UserId)
end)
game.Players.PlayerRemoving:Connect(function(user)
    DS:SetAsync(user.UserId,user.leaderstats:FindFirstChild(StatName).Value)
end)

Save and load script. Basic save and load, It can be made better using UpdateAsync() but this will also work.

Take a look at this question's top answer, while the question isn't completely related, the answer should probably help you out

https://scriptinghelpers.org/questions/41698/how-to-save-multiple-values-in-a-datastore